Features1CNC strengthened treatment has no abnormal noise, and the locking shaft is pressfitted. The interlocking design can reduce noise and improve rigidity. The sealing system is easy to maintain and lubricate. 2Washers are used for 2224mm / 0.870.94in hollow cranks to adjust the distance of the chain center line of the crank disc; three finetuning washers (1mm/2mm/3mm) are provided for the convenience of customers. 3Because it is nonmagnetic and does not absorb dust, it can reduce bearing peeling and noise in advance, high strength, light weight, 1/3 of the weight of metal, good surface smoothness, and low friction coefficient. 4Exquisite threaded lock enhances the lateral stability without loosening and no abnormal noise. Conversion of the reducing sleeve can be used with cranksets of different brands and models. 5Integral sealed bearing, which prolongs the service life, retains the lubricant in the bearing, has good dustproof and waterproof effect, and is suitable for harsh riding environments. 6Ceramic bearing bearing, silicon nitride ceramic ball, corrosion-resistant, wear-resistant, long service life, and can be used as usual in harsh environments. 7Using T6 heattreated highstrength aluminum alloy material, CNC process processing, the weight is light and the strength will not decrease.SpecificationItem Type: Bike Lock Bottom BracketMaterial: Aluminum Alloy + Ceramic BearingPackage List1 x Lock Bottom Bracket1 x Reducing Sleeve3 x Washer